>>1982239the official record for running a marathon is 2hours ,50km on ski is 1:46 (but snow conditions are so variable you cant really call it official records on ski)
thats all flat roads or prepped ski tracks, imagine doing the same on 3m deep, loose snow. you might not me able to move around without skiis but with them you can cover 20 to 30 km in a day with full camping gear.